Abstract
The influence of a palladium adlayer on the surface topography of a needle-shaped
tungsten crystal is studied using Field Ion Microscopy. When the curved surface
is covered by palladium and annealed at 1000-1200 K, both macroscopic faceting
and steplike microfaceting is observed. The macroscopic {110} and {211}
crystal facets increase in size, {211} steplike microfacets are formed around
<111> poles, {110} and {211} steplike microfacets are formed in <111>
crystal zones. With the increase of annealing temperature the number of
{211} microfacets decreases, while the macroscopic {211} facets increase
in size. At 1300 K no faceting is observed because palladium desorbs thermally.